The invention discloses a Zynq-based multichannel AM and FM demodulation method. The method comprises the following steps of command issuing and data collection, digital down conversion and AM demodulation or FM demodulation. Four demodulation channels are provided, and AM / FM modulation signals in four channels can be demodulated at the same time. As digital down conversion and signal demodulation which require a large amount of logic resources are put in an FPGA for operation, the FPGA has a parallel processing capability and provides special DSP resources, the demodulation data rate for the FPGA is theoretically only limited by the clock rate of the FPGA (Zynq can reach 300 MHz or above), and as the FPGA has the parallel processing capability, the signal precision (data bit width) is improved as much as possible when digital down conversion and demodulation are carried out, the FPGA operation speed is not influenced in a condition in which the resources are met, and real-time processing of multichannel signals can be met completely.